We have analyzed the exception details which you have posted in the last post and we were not able find the actual cause of this issue. So it’s not possible to fix this issue without the actual input excel files. Please could you share us the input template which reproduces the issue. This will be helpful for us to further investigate this issue.

We have analysed further for the above reported stack trace and we came across the following solutions.

1.When using the IWorkbook object as global and ExcelEngine object used with in a method there is a chance for the above reported error.

Please make use of the ExcelEngine object as global where the IWorkbook is derived from the ExcelEngine.

2.Using the static method which instantiates the ExcelEngine and IApplication objects and it return the workbook object from another class file also throws the above error.

Please use the ExcelEngine and IApplication objects in the main class (Ex.,Aspx Page) and use it.

Please try the above secnarios at your side and let us know if this helps you. If you still face the issue, please get back to us with the simplified sample which reproduces the issue to proceed further on this.